Publication: Effect of cold deformation on properties of aluminium alloy fabricated using wire arc additive manufacturing technique
No Thumbnail Available
Date
2023-04-01
Authors
Muhammad Ajwad Bin Roslee
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Additive manufacturing (AM) owns a huge potential in repair and remanufacturing
industries due to its advantage of minimizing waste while having the abilities to produce
complex shapes without mold. Current technique to obtain net shape is limited due to
strength and lead time issues. AM also provides low cost solution for repairs with wire
arc additive manufacturing (WAAM) which use common welding technique. However,
this method produces parts with lower strength and hardness due to the high heat input
and porosity. In this study, WAAM produced parts was constructed using manual TIG
welding at different orientation and welding direction and new strategy was proposed,
where cold forging process is introduced as a post deposition treatment, where the parts
are subjected to different thickness reduction. The main aim of this study is to evaluate
the tensile properties and hardness of forged AA4043 wire arc additive manufacturing
(WAAM) constructed at different welding orientation and direction. Result discovered
that the ultimate tensile strength (UTS) increased by 44%, from average UTS of 160 MPa
to 200 MPa, and hardness value increases by 70%, from average hardness of 43 HV to 73
HV. Using SEM analysis, it is discovered that forging reduced the porosity sizes by 90%.
Even with the improvement made by forging, upright orientation still suffer from
interlayer strength, producing lower UTS compared to other parameters.
Keywords: WAAM; AA4043; strain hardening; cold forging; repair